linux-kernel - Re: [PATCH] mmc: sdhci-of-aspeed: Turn down a phase correction warning

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Date:   Mon, 7 Jun 2021 04:11:28 +0000
From:   Joel Stanley <joel@....id.au>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Steven Lee <steven_lee@...eedtech.com>
Subject: Re: [PATCH] mmc: sdhci-of-aspeed: Turn down a phase correction warning

On Mon, 7 Jun 2021 at 01:30, Andrew Jeffery <andrew@...id.au> wrote:
>
> The card timing and the bus frequency are not changed atomically with
> respect to calls to the set_clock() callback in the driver. The result
> is the driver sees a transient state where there's a mismatch between
> the two and thus the inputs to the phase correction calculation
> formula are garbage.
>
> Switch from dev_warn() to dev_dbg() to avoid noise in the normal case,
> though the change does make bad configurations less likely to be
> noticed.
>
> Reported-by: Joel Stanley <joel@....id.au>
> Signed-off-by: Andrew Jeffery <andrew@...id.au>

Reviewed-by: Joel Stanley <joel@....id.au>

> ---
>  drivers/mmc/host/sdhci-of-aspeed.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
> index d001c51074a0..e4665a438ec5 100644
> --- a/drivers/mmc/host/sdhci-of-aspeed.c
> +++ b/drivers/mmc/host/sdhci-of-aspeed.c
> @@ -150,7 +150,7 @@ static int aspeed_sdhci_phase_to_tap(struct device *dev, unsigned long rate_hz,
>
>         tap = div_u64(phase_period_ps, prop_delay_ps);
>         if (tap > ASPEED_SDHCI_NR_TAPS) {
> -               dev_warn(dev,
> +               dev_dbg(dev,
>                          "Requested out of range phase tap %d for %d degrees of phase compensation at %luHz, clamping to tap %d\n",
>                          tap, phase_deg, rate_hz, ASPEED_SDHCI_NR_TAPS);
>                 tap = ASPEED_SDHCI_NR_TAPS;
> --
> 2.30.2
>